Although injection molding and compression molding are both useful plastic manufacturing methods, in many cases, injection molding is considered superior. It has higher production efficiency, higher complexity and accuracy, lower raw material waste, more consistent quality control, lower unit costs, and better environmental friendliness. Therefore, manufacturers and engineers usually choose injection molding as the preferred plastic manufacturing method, especially when large-scale production and high quality requirements are required.
Of course, for certain specific applications, compression molding still has its advantages, such as in small-scale production or handling special materials. But overall, injection molding plays an important role in modern manufacturing, providing high-quality and efficient manufacturing solutions for various industries.
1: The basic principles of injection molding and compression molding







2. Compression molding






2: Why injection molding is better


Injection molding is usually faster than compression molding because it involves injecting molten plastic into the mold at high speed without waiting for the plastic to fill the entire mold cavity. This makes injection molding suitable for large-scale production and enables the production of a large number of parts in a short period of time.







Despite the high cost of injection molding equipment and molds, in large-scale production, it is usually able to provide lower unit costs due to high efficiency and raw material utilization. Although compression molding has lower equipment costs, it may incur higher production costs in long-term operation.